TWI568572B - Glass protective film - Google Patents

Description

Glass protective film

The present invention relates generally to a glass protective film, and more particularly to a glass protective film for use in a glass panel for manufacturing a liquid crystal display (LCD).

The invention provides an improved glass protective film for a liquid crystal display screen. An LCD glass protective film includes: a first side which is a surface having a low viscosity; and a second side which is a non-tacky surface composed of a plurality of beads. In the LCD glass protective film, the first side (low viscous side) is adhered to a glass panel. Since the second side (non-adhesive surface) is composed of a plurality of non-adhesive beads, when an LCD glass protective film is mounted on the LCD glass panel, it is not necessary to add a layer of paper interlayer.

According to the film transistor process standard, a glass panel used to fabricate an LCD must be kept clean. The use of a glass protective film is based on the manufacture of the film and the cleanliness of the film to maintain its height. When the non-adhesive surface of the second side of the glass protective film adheres to the glass panel with insufficient adhesion, the backing paper must be used together with the glass protective film.

When the glass protective film and the paper intermediate layer are used together, the surface of the glass panel is rubbed and scraped by the backing paper, so that the quality of the glass panel is deteriorated, and external impurities are adhered to the glass panel by the backing paper. Therefore, a glass panel with a backing paper must be cleaned before it is made into a transistor. In this case, if a cleaning agent is used to clean the glass panel, the detergent will remain on the surface of the glass panel.

An LCD having a backing paper and a glass protective film in comparison with an LCD glass panel having a glass protective film attached to the glass surface of the LCD and having a backing paper between the glass panel and the glass protective film and a glass panel having only a backing paper The glass panel will have a slight scratch. When using a glass protective film that does not have sufficient non-stickiness, when the backing paper is not used, and when a plurality of glass panels are separated from each other first, and then carried again, there is a glass surface later. The board is attached to the front glass panel and transported together. At this point, it will fall and break. When the glass protective film and the backing paper are used at the same time, the subsequent processes become complicated, and the cost of the backing paper is additionally added, and the cleanliness of the LCD glass panel is deteriorated by the added backing paper.

Since the size of the LCD screen is large, and the thickness of the LCD glass panel is also as thin as about 1 mm, it is difficult to handle the LCD glass panel which is so small in size and often damaged even if two people are careful to handle it. .

Techniques conventionally used to produce LCD glass protective films are disclosed in U.S. Patent Nos. 5,100,709, 6,040,046, 6,387,481 B1, 4,895,760, 6,326,081 B1, and the like. However, this type of product uses a glass protective film and a backing paper at the same time, and therefore, it is necessary to form a glass protective film which does not require the use of a backing paper. In a glass protective film that does not require the use of a backing paper, the first side must be low-viscosity for the glass panel, and the second side must be present between the protective film or between the protective film and the glass panel. It has sufficient non-stick properties.

Korean Patent No. 10-0776197 discloses a glass protective film which is constructed such that its first side is adhered to a glass panel with low adhesion and the second surface is sufficient for the second glass panel. Non-sticky. Based on this, if the glass protective film has a rough surface and the rough surface is non-tacky to the glass panel, the backing paper may not need to be provided. In order not to provide the backing paper, the glass protective film must exhibit a relatively non-stick property to safely separate the stacked glass panels when the glass panel is transported for a predetermined time.

However, a glass protective film having a rough surface composed of a plurality of beads may not provide a backing paper, and the second side thereof is coated with a polymer (fine beads) which is a protective film of the glass. The economic benefit is low because a disc-shaped grinder is used in the preparation of the polymer powder, which results in a relatively low yield of fine beads. In addition, such a glass protective film is problematic because the shape of the minute microbeads is irregular, and the fine beads include cracks and detachable tails or projections, so The ratio of defective products is improved in the manufacture of LCDs.

Korean Patent No. 10-0776197 discloses a glass protection without using a liner The film, which comprises a base film, the first side of the base film is a low-viscosity surface for the glass panel and the second side is a rough bead surface. The glass protective film is formed into a thin leaf shape so that it can be easily removed after use, that is, the subsequent procedure can be easily performed. Here, the rough bead surface is formed by extruding the melted polymer into a polymer film; spraying the microbeads on the polymer film at a predetermined density; and spraying the fine beads The polymer film is cooled and processed while simultaneously attaching it to the second side of the base film.

During the formation of the fine beads and the second side of the glass protective film (rough bead), a low density resin (LDPE) is atomized by a disc-shaped grinder to form a low density. Resin powder. Since the shape and size of these low-density resin powder particles are irregular as shown in Fig. 7, polymer particles having a size of 500 to 600 μm must use a 40 mesh screen and a 50 mesh sieve in the classification process. Net to get the best fine beads.

When a wide range of powders containing fine beads having a size of 50 to 500 μm are used for the production of a glass protective film, the yield of fine beads can be increased by a disc-shaped grinder, but the fineness attached to the base film The difference in the height of the particles will increase. Therefore, as shown in Figure 3, the maximum limit of fine beads is greatly reduced to 15-20%, which also reduces the non-sticking effect of the glass protective film. In addition, when the low-density polymer is atomized to become fine particles of 450 to 550 μm, it is often difficult to separate the fine particles; therefore, the rough bead surface of the glass protective film is at the maximum of its fine beads. Will be restricted.

In order to overcome the above problems, the present invention provides a method of cutting a polymer film having a certain thickness and shape and size into standard fine beads.

In order to solve the above problems, the present invention provides a method of standardizing fine bead powder. Therefore, it is expected that the yield of the fine beads after processing can be greatly increased, and the non-stick property of the glass protective film can be improved, and the ratio of defective products in the LCD manufacturing process is also greatly reduced. .

In the glass protective film which does not use the backing paper, the first side of the base film is a low-viscosity surface, which is low-viscosity for a glass panel, and the base film is The two sides are rough bead surfaces that are non-tacky for a glass panel or glass film. The present invention is to provide a glass protective film having a base film, and the second side (rough bead surface) of the base film is modified. In addition, the non-stick properties of the glass protective film provided by the present invention are improved by standardizing the shape and size of the fine beads of the polymer to increase the maximum limit of the fine beads attached to the base film. The glass protective film provided by the invention removes the protrusion which is easy to break or is easy to be detached by the atomization of the fine beads on the glass protective film using the cut fine beads, thereby reducing the occurrence thereof. The ratio of 瑕玼. The glass protective film provided by the present invention reduces the manufacturing cost of the fine beads by increasing the yield of the processed fine beads when the fine beads are formed. The present invention is directed to providing a fine bead for cutting by cutting a polymer film. The present invention provides a glass protective film having a rough bead surface formed by, for example, hexagonal fine beads, square fine beads or triangular fine beads The granules are cut and attached to a film. The present invention provides a glass protective film having a rough bead surface formed by attaching polymer spherical fine beads to a film.

When a standard fine bead is formed by cutting a polymer film having a predetermined thickness, shape, and size, the standardized fine bead has a particle size required to increase the yield of the product for processing the fine bead, and the particle is in the size. The difference in the difference is greatly increased, and the maximum limit of the fine beads is greatly increased, and the non-stick property of the glass protective film can be improved, and the fine particles are not incorporated into the glass protective film to reduce the occurrence of defects in the LCD production process. The ratio of defective products.

The film for forming the cut fine beads is a polymer film having a thickness of 150 to 550 μm. Examples of the low-density film for forming the cut fine beads may include a low-density polyethylene film, a polyolefin fiber, an olefin monomer film such as EVA, EAA, EMMA or the like, a polar group containing a copolymer film , polyolefin rubber film and other rubbers.

Examples of the high-density film for forming fine beads may include a polyethylene film, a polypropylene film, a polymethacrylate, a polypropylene (PS) film, an acrylonitrile butadiene styrene polymer film (ABS), High-strength polystyrene film (HIPS), styrene monomer-containing copolymer, polyester film, polyester elastomer, nylon elastomer, polyester-based polymer film, and nylon-based polymer film.

The shape of the cut fine beads is not particularly limited, but it is preferable that the fragmented portions are not maintained in a two-dimensional flat film to facilitate the operation of the cutter. This type of zero Fine beads that are capable of not being in a two-dimensional planar film and that facilitate the operation of the cutter may include hexagonal fine beads, square fine beads, and triangular fine beads.

If economic benefits are not considered, in addition to the cut fine beads, the spherical beads may also adhere to the non-stick surface (second side) of the glass protective film to form a rough bead surface.

The spherical fine beads can be obtained by first melting a polymer, then applying a surface tension to the melted polymer, or by cutting the cooled polymer into pellets, and then grinding the particles. To form spherical fine beads.

The cut fine beads are attached to the base film by spraying on the base film. In particular, the melted low-viscosity polymer is first extruded by an extruder and then formed into a film by a stamper assembly. The chill roll device includes a mirror-forming roller for forming a mirror surface (low viscous surface) on the first side of the base film, and a cooling rubber wheel for carrying the aforementioned fine beads and the fine beads Attached to the second side of the base film. The bead sprayer is placed above the cooling rubber wheel.

The fine beads placed in the bead sprayer are cut-type fine beads which may include hexagonal, rectangular, triangular, and spherical fine beads.

The cut-type fine beads and the spherical beads are sprayed onto the cooling rubber wheel, converted to the second side of the film, and attached to the second side of the base film to form a rough surface having a high bead achievement rate.

Most of the cut-type fine beads, such as hexagonal, rectangular, triangular, and spherical fine beads, are included in the uppermost region of the glass protective film.

In the process of forming the cut type fine beads, the yield of the fine beads after processing is relatively high.

The present invention provides a glass protective film which is standardized by the shape and size of the polymer beads, and then the standardized polymer beads are attached to a film. The glass protective film provided by the present invention has a high bead formation rate to form a rough surface. The glass protective film provided by the invention can reduce the occurrence ratio of the product during the LCD manufacturing process, and mainly appears on the glass protective film by preventing the rupture or the easy separation. The glass protective film provided by the present invention can reduce the cost at the time of manufacture by increasing the yield of the fine beads while manufacturing the fine beads. The glass protective film provided by the invention has a rough bead surface, It is mainly formed by attaching hexagonal, rectangular or triangular fine beads to the cut type fine beads.

1‧‧‧ glass protective film

2‧‧‧Low-viscosity

3‧‧‧No adhesive surface

1a‧‧‧ first floor

1b‧‧‧ second floor

1c‧‧‧ third floor

10‧‧‧ glass protective film

11‧‧‧ base film

12a‧‧‧Low-viscosity

13‧‧‧Rough bead

13a‧‧‧No sticky rough bead

15‧‧‧Highest reach

15a‧‧‧ upper boundary

15b‧‧‧Border line

17‧‧‧fine beads

17a‧‧‧ crack

17b‧‧‧ tail

17c‧‧‧swelling department

18‧‧‧Dependent area

27‧‧‧ hexagonal fine beads

37‧‧‧Rectangular fine beads

47‧‧‧Triangular beads

57‧‧‧Spherical beads

101‧‧‧Extrusion

102‧‧‧film assembly

103‧‧‧Bead Sprayer

104‧‧‧Mirror surface forming wheel

105‧‧‧Cool rubber wheel

106‧‧‧Final Rubber Wheel

11m‧‧‧Modular film

G‧‧‧ area

The above and other objects, features, and advantages of the present invention will become more apparent from the aspects of the accompanying drawings <RTIgt; Is a cross-sectional view of another conventional glass protective film; Figure 3 is an enlarged cross-sectional view of the glass protective film to which the powdery fine beads are attached; and Figure 4 shows a disc-shaped grinder before sorting. a micro-developed image of the powdered polymer; Figure 5 shows a micro-developed image of the fine beads after processing in powder form; Figure 6 shows a photograph of the fine-grained size of the powder; Figure 7 shows It is a graph of the feasibility of grinding fine beads into a powder through a disc grinder; Figure 8 shows an enlarged perspective view of hexagonal fine beads; and Figure 9 shows an enlarged perspective view of rectangular fine beads. Figure 10 shows an enlarged perspective view of the triangular fine beads; Figure 11 shows an enlarged perspective view of the spherical fine beads; Figure 12 shows a microscopic development of the cut hexagonal fine beads; Graphic display Photographs of the cut hexagonal fine bead size; Figure 14 shows the feasibility of the cut hexagonal fine bead processing; Figure 15 shows the grinding through the disc grinder and through The film is cut into a pattern of size comparison after powder; FIG. 16 is a schematic view of a film forming apparatus having a fine bead attachment unit; and FIG. 17 is a view showing a hexagonal fine bead having a cut type attached thereto. An enlarged cross-sectional view of the glass protective film; Figure 18 is an enlarged cross-sectional view showing the glass protective film having the cut rectangular fine beads attached thereto; and Figure 19 is an enlarged cross-sectional view showing the glass protective film having the cut triangular fine beads attached thereto; And Fig. 20 shows an enlarged cross-sectional view of the glass protective film having the cut spherical fine beads attached thereto.

The present invention does not use a backing paper, and the glass protective film disclosed in Korean Patent No. K07-0776197, US Pat. No. 6,326,081 and Chinese Patent No. CN101472981B has a base film whose first side has low viscosity for a glass panel. The low-viscosity side, while the second side has a rough surface that is non-sticky to a glass panel or film.

According to the method of providing viscosity to the low-viscosity surface (first side) of the glass protective film, the glass protective film can be distinguished as a viscous coating film and a self-adhesive film. The formation of the viscous coating film is formed by coating a viscous layer on a glass panel. When the viscous coating film is removed from the glass panel, there is a sticky residue on the surface of the glass panel. Adhesives that remain on the surface of the glass panel can cause serious damage to the LCD process. The self-adhesive film adheres to the glass panel mainly by the adhesiveness of the bottom polymer itself, and it is not necessary to separately coat a viscous layer on the glass panel. The self-adhesive layer may be any low density polyethylene, polyolefin fiber, olefin monomer film such as EVA, EAA, EMMA or the like, polar group including copolymer film, polyolefin rubber film and other rubber class.

When the first side closely attached to the glass panel is added to increase its viscosity to form a base film, the viscous material remaining on the glass panel is also increased by increasing the viscosity. In order to reduce the residual amount of the viscous material, the base film can be made of a polymer having a low viscosity, and the surface attached to the glass panel is formed as a mirror surface, thereby increasing the base film for the glass panel. Stickiness. This base film exhibits a relatively high viscosity and a relatively low peeling degree to the glass panel.

In addition, in the glass protective film, a rough bead surface is formed on the second surface of the low-viscosity film, so that the used glass protective film can be removed in the air intake duct of the LCD process, and can be easily Handle it.

The rough bead surface melts a low viscosity polymer to form a base film, and when cooling and treating the base film, the fine beads are dispersed and attached to one side of the base film. The base film for forming a rough surface may be a one-, two-, or three-layer film.

In the glass protective film 1 as shown in Fig. 1, the first side of the base film is a low-viscosity surface 2 which is made of a low-viscosity polymer. The second side is a non-adhesive surface 3, and a rough bead surface is formed on the surface. Therefore, the glass protective film 1 is usually formed as a one-layer base film, but it may also form a two-layer or three-layer base film as shown in Fig. 2 as needed. The three-layer base film shown in Fig. 2 is a multilayered base film including a first layer 1a, a second layer 1b, and a third layer 1c which are stacked and attached to each other.

Fig. 3 is an enlarged cross-sectional view showing the glass protective film 10 made of powder fine beads formed by a disk-shaped grinder. The glass protective film 10 is formed by melting a low-viscosity polymer to form a base film 11, and then the fine beads 17 coated on a rubber wheel in a cooling process are attached to the bottom. The second surface of the film 11 is formed. In the glass protective film 10 formed in this manner, the first side is a low-viscosity surface 12a which is affected by a low-viscosity polymer, and the second side is a non-adhesive rough bead surface 13a. The non-tacky rough bead surface 13a has a low degree of bead maximum achievement because the beads have many different sizes and shapes. Further, the glass protective film includes an attachment portion 18 formed between the fine beads 17 and the base film 11. When the heat remaining in the melted polymer is transferred to the fine beads 17 during the cooling process of the base film 11, the attachment portion 18 is formed along the interface between the base film 11 and the fine beads 17.

The fine beads are sprayed onto the cooling rubber wheel of a cooling rubber wheel by a bead sprayer, and then re-converted through the cooling rubber wheel set and attached to the second side of the base film. When the fine beads are sprayed on the cooling rubber wheel, the cooling rubber wheel and the bead sprayer are spaced apart from each other by a predetermined distance, so that the fine beads can be evenly distributed on the cooling rubber wheel.

Figure 16 shows a film forming apparatus including a bead sprayer. A melted low viscosity polymer is first extruded by an extruder 101, and then a film 11m is formed by a die assembly 102. The formed film 11m passes through a cooling rubber wheel set 104, 105 and is simultaneously cooled and processed, after which it is collected at a final rubber wheel 106. At the film forming apparatus, a bead sprayer 103 is disposed on a cooling rubber roller 105 at a predetermined distance (G) from the cooling rubber roller 105, and thus, the fineness ejected by the bead sprayer 103 Beads are available It passes through the air and is evenly and evenly distributed on the cooling rubber wheel 105. The cooling rubber wheel set includes a mirror forming wheel 104 for forming a mirror surface (low viscosity surface 12a) on the first surface of the base film 11, and a cooling rubber wheel 105 for carrying and The fine beads are attached to the second side of the base film 11. Since the cooling rubber wheel sets 104, 105 are continuously rotated when the formed film 11m is cooled, the fine beads scattered on the cooling rubber wheel are transferred to the second side surface of the film 11m, and thereafter, Both sides of the base film 11 are cooled and attached thereto to form a rough bead surface 13a. Therefore, when a melted low-viscosity polymer is formed into the film 11m and passes through the cooling rubber wheel set, the first surface of the base film 11 is formed into a mirror surface (low-viscosity surface 12a), and The second side is covered with fine beads and thus forms a rough bead surface 13a.

The fine beads have a particle size of 1000 μm or less. When the particles of the fine beads are processed by powdering and reach 5 μm or less, at a distance of G, these small particles will be lost. When the size of the particles is as small as 20 μm, the free fall time will be delayed. When the size of the particles reaches 1000 μm, the fine beads rise from the thin base film, so the fine beads are pressed between the glass panels and smashed into fine particles. Therefore, preferably, the size of the fine particles is considered at the speed of the free fall, and is preferably between 50 and 500 μm in consideration of the speed at which the glass panels are separated in the LCD process.

Such fine beads can be made of an inorganic material including calcium carbonate and a polymer. However, in order to firmly adhere the fine beads to a film in the curing process, polymer beads which are easily attached to the base film containing the polymer can be used. In order to increase the adhesion efficiency between the fine beads and the protective film, the melting point of the fine beads formed of the polymer may be equal to or smaller than the melting point of the base film. However, in the curing process, by pressing the fine beads to attach the fine beads to the protective film, the bonding relationship therebetween is not sufficient to attach the fine beads to the protective film. Even though the melting point of the fine beads is larger than the melting point of the base film, the fine beads can be firmly attached to the surface of the base film without any problem. In addition, when a polymer having low viscosity is used as the fine beads of the polymer, the problem caused by the non-adhesive rough bead does not occur.

Examples of the bottom density polymer used as the fine beads may include polyethylene, polyolefin fibers, olefin monomers such as EVA, EAA, EMMA or the like, polar groups including copolymer films, polyolefin rubber And other rubbers.

The high density film used to form the fine beads may include polyethylene, polypropylene, Polymethacrylate, polypropylene (PS), acrylonitrile butadiene styrene polymer (ABS), high strength polystyrene (HIPS), styrene monomer copolymer, polyester, polyester elastomer, Nylon elastomer, polyester based polymer and nylon based polymer.

The density of the fine beads on the second side of the base film may be 0.1 to 7 g/m ² , preferably 3 g/m ² .

The LCD glass protective film manufactured in this way has been a trend for many years in increasing the size of the LCD substrate and mass production of the LCD substrate. However, the quality requirements of LCD glass protective films have become stricter with the increase in size, and because of the price competition of LCDs, the reduction in the production cost of glass protective films is also necessary.

Although the glass protective film manufactured by this method exhibits a non-stick characteristic because the second side thereof is a rough bead surface, the size of the LCD panel increases, and the price in the market competes. High quality and low price glass protective film is still needed.

Figure 3 shows a conventional rough bead mask. In the further study of the intensive roughened beadlessness, the fine beads of the conventional rough bead mask shown in Figure 3 have a maximum value of less than 25%. When the maximum achievement rate of the fine beads on the second surface of the base film 11 is not high, the non-sticky distribution of the film is not uniform, and therefore, the glass protective film is rendered non-sticky and has a poor shape.

The maximum rate of formation of fine beads in the rough bead mask is an indicator that the fine beads adhere to the maximum area 15 of the film.

In Fig. 3, the maximum value achievement region 15 for calculating the maximum value achievement ratio is defined as being between the upper boundary 15a and the highest point of the highest point of the tangential fine beads and half the height between the second faces of the base film 11. The lower boundary line 15b.

Method of assessment of the highest achievement rate

In order to be able to evaluate the highest achievement rate of the glass protective film, the factors to be examined include: film thickness (reference factor), inspection area (for example: a square area of 5 cm x 5 cm), and the range of the highest area in the inspection area a~b ( High point a μm, low point b μm=a/2), total number of inspected beads (BN), number of beads reaching maximum achievement rate (UBN), and calculation of maximum achievement rate (UN=(UBN/BN)100 ).

The maximum achievement of the rough bead mask is the fine beads that reach the maximum area (a~b) The number of grains is expressed as a ratio compared to the total number of fine beads.

In order to evaluate the maximum achievement rate of the conventional rough bead mask, a rough bead film made of fine bead powder having a particle size of 50 to 500 μm is prepared, and thereafter, based on the above criteria, the maximum achievement rate is made. Evaluation. The result is that the maximum achievement rate is usually less than 20%.

According to a conventional method for producing a rough bead on a second side of a glass protective film, a low density resin (LDPE) is first ground into a powder form via a disc grinder. In this way, since the particle shape and size of the low-density resin powder formed into a powder form are irregular, the low-density resin powder is classified by a 40 mesh screen and a 50 mesh screen, and is selected and refined. It also has fine beads with a particle size of 500-600 μm.

Preferably, the fine beads have a particle size of preferably 500 to 600 μm and are present as fine beads. However, the fine-grained beads which are pulverized by a disc-shaped grinder to form powders have different and irregular shapes as shown in the fourth figure. A 40 to 50 sieve is used to classify the refined fine beads, and it is still seen that each of the fine beads 17 has a crack 17a, and many such as the tail portion 17b or the swelling portion 17c. In this case, these irregularities such as the tail portion 17b or the swollen portion 17c are likely to be peeled off from the glass protective film after the use of the glass protective film.

When a low-density resin (LDPE) is ground into a powder by a disc grinder, the yield of the refined fine beads will become low, which becomes a disadvantage.

The polymer powder including the fine beads was prepared by grinding a low-density resin with a disc grinder, and then the function of the disc grinder was evaluated.

In Figure 7, in order to prepare fine beads with a particle size of about 500 μm, the internal value of the disc-shaped grinder and the overall value are set, and the polymer powder is prepared, and then the prepared polymer powder is in the pellet. The size distribution is analyzed using a particle analyzer. Thus, it can be seen that the size distribution of the polymer particles can range from 100 μm to 1300 μm, and the weight ratio of the most frequently distributed particles is about 38%. At the same time, even though the polymer powder is classified by a 40-50 screen, the yield of the polymer fine beads refined by the disc grinder is in terms of weight, and the maximum value is only 30%.

Even in another example, the polymer refined through the disc grinder is subtle The yield of the beads is in terms of weight, and the maximum value is only 20% or 16%.

Therefore, fine beads having a maximum particle size of less than 1000 μm can be used to form a rough bead of a glass protective film, but it is preferable to use fine beads having a particle size of 5 to 5000 μm. When a glass protective film is prepared using a wide range of polymer powders containing fine beads having a particle size of 50 to 500 μm, the yield of the fine beads using the disc-shaped grinder is increased, but is attached to the base film. The difference in the height of the fine beads will also increase accordingly. Therefore, the maximum achievement rate of the fine beads will be greatly reduced, thus causing the glass protective film to be inferior in the non-stick performance. Further, even if a low-density polymer is powdered using a disk-shaped grinder, and the powdered particle size has been adjusted to 450 to 550 μm, it is still difficult to completely separate the refined particles, so that the glass is The fine beads on the rough surface of the protective film are limited in improvement.

In order to overcome the above problems, a glass protective film is provided which cuts a polymer film having a thickness of 550 μm or less into a particle shape having a predetermined shape and a thickness of 200 to 600 μm to form a fine shape of a regular shape. After the beads, fine beads having a regular shape are attached to a base film in a density of 7 g/m ² or less.

When a regular-shaped fine bead is prepared by cutting a film having a predetermined thickness, the production yield of the refined fine bead is increased because a fine bead having an appropriate size can be prepared. Moreover, the maximum achievement rate of fine beads on the rough bead surface of the glass protective film is also increased, because the difference in size of the fine beads is much reduced, so that the non-stick property of the glass protective film is improved. And the risk of mixing refined particles is also much lower, so the ratio of defective products can be reduced in the LCD process.

Preferably, the thickness of the film for preparing the cut type of fine beads is preferably from 150 to 550 μm.

Examples of the low-density film for preparing the cut type of fine beads may include a low-density polyethylene film, a polyolefin fiber, an olefin monomer film such as EVA, EAA, EMMA or the like, including a copolymer film. Polar bases, polyolefin rubber films and other rubbers.

Examples of the high-density film for forming fine beads may include a polyethylene film, a polypropylene film, a polymethacrylate, a polypropylene (PS) film, an acrylonitrile butadiene styrene polymer film (ABS), High-strength polystyrene film (HIPS), styrene monomer-containing copolymer, polyester film, poly A lipid elastomer, a nylon elastomer, a polyester polymer film, and a nylon-based polymer film.

The shape of the cut fine beads is not particularly limited, but it is preferable that the fragmented portions are not maintained in a two-dimensional flat film to facilitate the operation of the cutter. Such fine fractions can be in a two-dimensional planar film and the fine beads which facilitate the operation of the cutter can include hexagonal fine beads 27 as shown in Fig. 8, and square fine beads as shown in Fig. 9. The triangular fine beads 47 shown in Fig. 37 and Fig. 10.

Since the hexagonal fine beads 27 are arranged in a honeycomb shape, the film including these hexagonal fine beads 27 can be cut without leaving any broken blocks. Further, the cutting section of the hexagonal bead 27 is similar to a circle, and the hexagonal fine bead 27 is preferably a fine bead. The honeycomb film is cut as it moves laterally in segments.

Further, the spherical beads 57 as shown in Fig. 11 may be attached to the non-adhesive side (second side) of the glass protective film to form a rough bead surface without considering economic benefits.

The spherical beads 57 can be formed by melting a polymer, then applying a surface tension to the melted polymer, or cutting the solidified polymer to form particles, and then the particles are added. Grinding.

Figure 12 is a micrograph showing the cutting of a polymer film having a thickness of 250 μm and a hexagonal shape using a hexagonal side having a diameter of 500 μm to form a cut pattern. Polymer powder (fine beads).

Figure 13 is a photomicrograph showing the cutting of a polymer film having a thickness of 250 μm and a hexagonal shape using a hexagonal side having a diameter of 500 μm to form a hexagon. Fine beads. The vertical and horizontal diameters measured by the fine beads 27 were 0.459 cm and 0.4324 cm, respectively. Therefore, polymer fine beads having an edge diameter of about 500 μm can be obtained.

Figure 14 is a diagram showing a graph in which a polymer film having a thickness of 250 μm and a hexagonal shape is cut by a cutting tool having a hexagonal side having a diameter of 500 μm to form a hexagon. The particle size distribution of fine beads. In the drawing of Fig. 14, the size of the powdery fine beads formed using a 40 mesh disk disc grinder is compared with the size of a fine bead which is formed into a powder using a 50 mesh disc grinder. The internal value and total value in the schema are used to compare the particle size distribution of the fine bead powder. In the schema The height line shows the size distribution of the hexagonal fine beads. As can be seen from Fig. 14, the distribution of hexagonal fine bead particles generally presents a narrow range from 0.42 to 0.77 mm, and the hexagonal fine beads which can be used to form rough bead have a dense particle size. The ground is presented in 0.48~0.62mm.

Figure 15 shows the particle size distribution of the fine bead particles obtained by pulverizing the polymer by a disk cutter and the particle size distribution of the hexagonal fine beads 27 obtained by cutting the polymer film. Comparison. The circled area for each particle size distribution represents the optimal particle size distribution area.

Figure 16 shows a device for forming a film by spraying fine beads on a base film.

According to the above apparatus for forming the film, the melted low-viscosity polymer is extruded by an extruder 101, and then a film 11m is formed by a stamper assembly 102. The formed film 11m is simultaneously cooled and solidified by a cooling roller set 104, 105, and then retracted at a final roller 106. In the film forming apparatus, a bead sprayer 103 is placed above a cooling rubber wheel 105 and is spaced apart from the cooling rubber wheel 105 by a predetermined distance G. Thus, the fineness sprayed by the bead sprayer 103 is fine. The beads are evenly distributed as they pass through the air and fall safely onto the cooling rubber wheel 105. The cooling roller set includes a mirror-forming wheel 104 for forming a mirror surface (low-viscosity surface 12) on the first surface of the base film 11, and a cooling rubber wheel 105 for carrying the fine beads. And attaching the fine beads to the second side of the base film 11. When the formed film 11m is cooled, since the cooling roller groups 104, 105 are continuously rotated, the fine beads (or spherical beads) positioned on the cooling rubber wheel are transferred to the second side of the film 11m, and at the bottom. The second side of the membrane 11 is cooled and attached to form a rough bead surface 13. Therefore, when a melted low-viscosity polymer is formed into a film 11m, and the film 11m passes through the cooling roller group, the first surface of the base film 11 is formed into a mirror surface (low-viscosity surface 12), and The second side is covered with fine beads so that a rough bead surface 13 can be formed.

The fine bead which is provided with the glass protective film by the apparatus shown in Fig. 16 is a cut type fine bead, and may include hexagonal fine beads 27, rectangular fine beads 37, triangular fine beads 47, spherical beads 57 and similar.

Figure 17 shows an enlarged cross-sectional view showing the use of a cut A rough bead mask formed by hexagonal fine beads 27 formed by the film. The rough bead mask is attached to the second side of a base film 11 by hexagonal fine beads 27. The rough bead mask includes an attachment region 18 formed between the hexagonal fine beads 27 and the base film 11. Although the hexagonal fine beads are somewhat different in height, since the hexagonal fine beads 27 are similar to each other, all of the hexagonal fine beads 27 belong to the highest reaching region 15.

Fig. 18 is an enlarged cross-sectional view showing a rough bead film formed by cutting rectangular fine beads 37 formed by cutting a film. The rough bead mask is attached to the second side of a base film 11 by rectangular fine beads 37. The rough bead mask includes an attachment region 18 formed between the rectangular fine beads 37 and the base film 11. Although the rectangular fine beads are somewhat different in height, since the sizes of the rectangular fine beads 37 are similar to each other, all of the rectangular fine beads 37 belong to the highest reaching region 15.

Fig. 19 is an enlarged cross-sectional view showing the rough bead mask formed by the triangular fine beads 47 formed by cutting a film. The rough bead mask is attached to the second side of a base film 11 by triangular fine beads 47. The rough bead mask includes an attachment region 18 formed between the triangular fine beads 47 and the base film 11. Although the triangular fine beads are somewhat different in height, since the sizes of the triangular fine beads 47 are similar to each other, all of the rectangular fine beads 37 belong to the highest reaching region 15.

Fig. 20 is an enlarged cross-sectional view showing a rough bead mask formed by cutting spherical fine beads 57 formed by cutting a film. The rough bead mask attaches the spherical fine beads 57 to the second side of a base film 11. The rough bead mask includes an attachment region 18 formed between the spherical fine beads 57 and the base film 11. Although the spherical fine beads are somewhat different in height, since the sizes of the spherical fine beads 57 are similar to each other, all of the spherical fine beads 57 belong to the highest reaching region 15.

The method of forming fine beads by cutting a film is quite advantageous because it does not produce fine powder, and the yield of refined fine beads is relatively high, thus improving economical efficiency.

Since the maximum achievement rate of the fine beads included in the rough bead surface of the glass protective film is nearly 100%, the non-stick characteristic of the glass protective film can be greatly improved, thereby increasing the speed at which the glass panel is separated.

Example 1 Using hexagonal fine beads to make a glass protective film Fine bead shape: Hexagonal film for forming fine beads: Low viscosity polyethylene fine beads having a thickness of 250 μm Particle size: 450 to 500 Melting point of μm fine beads: 140°C Base weight: 10 g/m ² Process environment: Clean room cooling Rubber roller diameter: 80 cm Linear velocity: 90 m/min Fine beads Dependent amount: 5 g/m ² The diameter of each hexagonal fine bead release hole located below the bucket to provide fine beads: 1.5 mm spacing of adjacent hexagonal fine bead release holes: 2 cm hexagonal fine bead release axis: rotary hexagon Distance between rod rubber roller and bead sprayer: 5 cm.

Example 2 Using a Rectangular Fine Bead to Make a Glass Protective Film Fine Bead Shape: Rectangular Example 2 was carried out in the same manner as in Example 1, except that the rectangular fine beads were used.

Example 3 Using Triangular Fine Beads to Make a Glass Protective Film Fine Bead Shape: Triangle Example 3 was carried out in the same manner as in Example 1, except that the triangular fine beads were used.

Example 4 The characteristics of the LCD glass protective film prepared in Examples 1 to 3 are as follows.

i) Viscosity: the low viscosity of the base film is the same as the viscosity of the polymer.

Ii) non-sticky

The rough bead formation was carried out by attaching standard cut-type fine beads to the second side of a thin base film having a weight of 10 g/m ² . It can be confirmed that the maximum achievement rate of the cut type of fine beads on the rough bead surface is quite high (94 to 100%), and the film also exhibits sufficient non-stickiness. Furthermore, it was confirmed that an air layer was formed on the second side of the base film by a rough bead having a high bead achievement ratio. Therefore, when the glass panels stacked together are transported, they can be easily separated.

When a hexagonal fine bead is attached to the second side of the base film having a weight of 10 g/m2, a rough bead surface is formed. Rough beading does not create an obstacle when using the intake mask to remove used film. Since the hexagonal fine beads protrude from the base film and serve as a kind of elastic material when the glass plates are stacked together, the glass panel can be more stably transported.

The detailed description above is a detailed description of one of the possible embodiments of the present invention, but the embodiment is not intended to limit the scope of the patent of the present invention. Equivalent implementation or change shall be included in the patent scope of this case.

1‧‧‧ glass protective film

2‧‧‧Low-viscosity

3‧‧‧No adhesive surface

Claims (7)

A glass protective film comprising: a base film having a first side having a low viscous surface and a second side of a rough bead surface; wherein the rough bead surface of the base film is formed to have a high achievement rate rule Fine beads; fine beads attached to the rough bead surface are prepared by cutting a polymer film; and by cutting a polymer film having a predetermined thickness, shape, and size to form a standard size and Forming the fine beads to increase the bead formation rate of the fine beads on the glass protective film to improve the non-stick property of the first surface of the glass protective film with low viscosity, and to enhance the The yield of the glass protective film. A glass protective film comprising: a base film having a first side having a low viscous surface and a second side of a rough bead surface; wherein the rough bead surface of the base film is formed to have a high achievement rate rule Fine beads; the fine beads attached to the rough bead are spherical fine beads; and by cutting a polymer film having a predetermined thickness, shape, and size to form a standard size and shape And fine beads to increase the bead formation rate of the fine beads on the glass protective film to improve the non-stick property of the first surface of the glass protective film with low viscosity, and to enhance the glass protective film Yield. The glass protective film according to claim 1, wherein the fine beads formed by cutting may be selected from the group consisting of hexagonal fine beads, rectangular fine beads, and triangular fine beads, fine beads. The particle size is 200 to 600 μm, and the fine beads are attached to the base film in an amount of 0.1 to 7 g/m ² . The glass protective film according to claim 1, wherein the polymer film used to form the fine beads is at least one of the group consisting of polyethylene film, polypropylene film, polymethacrylate, and polypropylene. (PS) film, acrylonitrile butadiene styrene polymer film (ABS), high strength polystyrene film (HIPS), styrene monomer copolymer, polyester film, polyester elastomer, nylon elastomer, A polymer film of a polyester group and a polymer film of a nylon type. The glass protective film according to claim 1 or 2, wherein the base film is Made of low density polyethylene. The glass protective film according to claim 1, wherein the polymer film used to form the fine beads has a thickness of 150 to 550 μm. The glass protective film according to claim 1 or 2, wherein the fine beads are sprayed onto a cooling rubber wheel via a bead sprayer, and the bead sprayer and the cooling The rubber wheels are separated by a predetermined distance. Thereafter, the fine beads on the cooling rubber wheel are first transferred and then attached to the second surface of the base film to form rough beads having a maximum achievement of 30-100%. surface.